CVE-2026-115567: Tokio: Race condition in `tokio::time::Interval`

Severity: medium (CVSS 5.8 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-23 · updated 2026-10-29
Weakness: CWE-362

Description

Tokio is a runtime for writing applications with Rust. In 1.54.0, a race condition between tokio::time::Interval::poll_tick (including .tick().await) and the multi-threaded runtime's time driver could drop an internal timer entry without synchronizing with the driver thread that was firing it. The race caused a use-after-free on the timer's waker and task state in safe Rust, which could produce assertion panics, task reference-count corruption, or heap memory corruption. This issue is fixed in 1.54.1.

Affected products

tokio-rs tokio: = 1.54.0

References

https://github.com/tokio-rs/tokio/commit/2b4eba7833864c04ecd2f3e5f4a97ff4f6fa28d0
https://github.com/tokio-rs/tokio/commit/5ed619bbaba87357ee5103d71b75e7c84cad99c9
https://github.com/tokio-rs/tokio/pull/8458
https://github.com/tokio-rs/tokio/pull/8692
https://github.com/tokio-rs/tokio/releases/tag/tokio-1.54.1
https://github.com/tokio-rs/tokio/security/advisories/GHSA-5wjr-9356-4wc8

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